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nouveau_dp.c revision 1.1.1.1 
      1 /*
      2  * Copyright 2009 Red Hat Inc.
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice shall be included in
     12  * all copies or substantial portions of the Software.
     13  *
     14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20  * OTHER DEALINGS IN THE SOFTWARE.
     21  *
     22  * Authors: Ben Skeggs
     23  */
     24 
     25 #include <drm/drmP.h>
     26 #include <drm/drm_dp_helper.h>
     27 
     28 #include "nouveau_drm.h"
     29 #include "nouveau_connector.h"
     30 #include "nouveau_encoder.h"
     31 #include "nouveau_crtc.h"
     32 
     33 #include <core/class.h>
     34 
     35 #include <subdev/gpio.h>
     36 #include <subdev/i2c.h>
     37 
     38 static void
     39 nouveau_dp_probe_oui(struct drm_device *dev, struct nouveau_i2c_port *auxch,
     40 		     u8 *dpcd)
     41 {
     42 	struct nouveau_drm *drm = nouveau_drm(dev);
     43 	u8 buf[3];
     44 
     45 	if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
     46 		return;
     47 
     48 	if (!nv_rdaux(auxch, DP_SINK_OUI, buf, 3))
     49 		NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
     50 			     buf[0], buf[1], buf[2]);
     51 
     52 	if (!nv_rdaux(auxch, DP_BRANCH_OUI, buf, 3))
     53 		NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
     54 			     buf[0], buf[1], buf[2]);
     55 
     56 }
     57 
     58 bool
     59 nouveau_dp_detect(struct drm_encoder *encoder)
     60 {
     61 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
     62 	struct drm_device *dev = encoder->dev;
     63 	struct nouveau_drm *drm = nouveau_drm(dev);
     64 	struct nouveau_i2c_port *auxch;
     65 	u8 *dpcd = nv_encoder->dp.dpcd;
     66 	int ret;
     67 
     68 	auxch = nv_encoder->i2c;
     69 	if (!auxch)
     70 		return false;
     71 
     72 	ret = nv_rdaux(auxch, DP_DPCD_REV, dpcd, 8);
     73 	if (ret)
     74 		return false;
     75 
     76 	nv_encoder->dp.link_bw = 27000 * dpcd[1];
     77 	nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
     78 
     79 	NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
     80 		     nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]);
     81 	NV_DEBUG(drm, "encoder: %dx%d\n",
     82 		     nv_encoder->dcb->dpconf.link_nr,
     83 		     nv_encoder->dcb->dpconf.link_bw);
     84 
     85 	if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
     86 		nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
     87 	if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
     88 		nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
     89 
     90 	NV_DEBUG(drm, "maximum: %dx%d\n",
     91 		     nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
     92 
     93 	nouveau_dp_probe_oui(dev, auxch, dpcd);
     94 
     95 	return true;
     96 }
     97